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McCarthy said "any triggering mechanism" like psychological or physical stress, including the fetish sexual activity engaged in with Walker, could have caused the cardiac arrhythmia that led to his death.

"Milan Walker accepts that she is criminally liable and responsible for the killing of Hudson in those circumstances," he said.

During sentence submissions yesterday afternoon, Walker's defence lawyer said she should be sentenced to a maximum five years in jail which should be suspended after serving two years.

After serving time she may be deported to New Zealand, despite spending most of her life in Australia, where all her family except her father live, the court heard.